A friend of mine recently had a birthday party. I was away on holiday and couldn't go but SIL and her boyfriend also know the couple I'm friends with and they went along.
It was clear when I next spoke to my friend that something had happened at the party that she was pretty pissed off about. It turned out that SIL's boyfriend had brought his own stereo and speakers, unplugged the music that was playing and set up his own music system and tunes... Everyone was too astonished to stop him but my friend was apparently seething all night. When SIL's boyfriend picked up on this he did ask if there was a problem and she said no because she didn't want to create a scene.
Most of us can't stand the boyfriend anyway but I was more surprised when SIL talked to me about it later. She had been wondering why so many of that group of friends had been funny with her since the party. I told her that I'd heard about the 'issue' with the sound system and wouldn't be surprised if people thought his behaviour had been quite rude.
She was very defensive, said that it had been her idea to bring the music system and that having to listen to bad quality music would have spoiled their evening!!!
I still insist that it's bloody rude and that they're lucky my friend's DH didn't chuck them out.
AIBU?